Turbine-blading.



W. J. A. LONDON, G. H. PLAINE & R. C. ALLEN.

APPLICATION FILED OCT-1, 1913.

WITNESSES.-

TURBINE BLADING.

Patented Aug. 10, 1915..

i Hi I INVENTORJ Wjlliam JA. Lqmdon qeorge if. Plazne:

RoberiC'.A Lien: BY

J1EE 4% F84; ATTORNEY.

ED ESTATES PATENT WILLIAM .A. LONDON, GEORGE HUNT-ER PLAINE, AND ROBERT C. ALLEN, OF HART- roan, CONNECTICUT, ASSIGNORS TO THE TERRY STEAM TURBINE COMPANY, or

HARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

TURBINE-BLADING.

Specification of Letters Patent.

Patented Aug. 10,1915.

Application filed October 1, 1913. Serial No. 792,774.

To all whom it may concern:

Be it known that we, WILLIAM J. A. LoN- DON and GEORGE .HUNTER PLAINE, subjects of the King of England, and residents of Hartford, county of- Hartford, State of Connecticut, and ROBERT C. ALLEN, a citizen of the United States, and resident of Hartford, county of Hartford, State of Connecticut, have invented certain new and use- Referring to the drawings, a denotes the body of the rotor, the periphery of Which is transversely slotted at regular intervals, as indicated at b. In each face of the rotor near its edge is a circumferential groove 0.

(1 denotes a blade or vane, and e the root which is fiat on its front face and of irregular formation on its rear face. The thickness of'the root is less than the width of the slot in which it fits, and a packing piece 7 is fitted into the slot back of the root, the front face of the packing piece being shaped to correspond with the rear face of the root, andthe rear face of the packing piece being flat to fill in the slot. The edges of the packing piece and root extend into the grooves c on the front and rear face of the rotor.

After all the blades have been assembled with their packing pieces, a setting tool spreads the roots and packing pieces into the grooves so that they lap the walls of the .grooves at'either side of the slots, securely locking the blades against either radial or lateral displacement. Of course a blade cannot move respectively to the packing piece owing to the fact that the contacting faces between the blade root and packing piece are of irregular shape. This construc- "tion produces a very secure fastening of the blades to the body of the rotor, and one which is quite inexpensive. It is also possible to replace a broken or. worn blade with little trouble, as compared with the security and strength of the built-up structure.

Of course it is understood thatthe outer ends of the blades may be shrouded in any desired manner as isusual in structures of this sort.

\Ve claim as our invention:

1. In a blade-fastening d'evice, thecornbination with a rotor body having transverse peripheral slots, and grooves in the sides intersecting the slots, of blades whose roots are located in the slots and packing strips located in the slots at one side of the roots, said roots and-packing strips being upset to interlock with the walls of the grooves.

2. In a blade fastening device, the combination with a rotor body having transverse slots in its periphery, and grooves in its sides intersecting said slots above their bottom, of blades provided with roots of irregular cross-section fitting in said sl0ts, packing strips filling said slots at one side of'said roots, said roots and packing stripsbeing interlocked with the walls of said grooves.

3. In a blade fastening device, the com' bination with a rotor body having transverse peripheral slots with straight walls,

of blade roots and packing strips fitting'in and filling said slots,the contacting faces of said roots and packing strips being of irregular contour, the edges of said roots and packing strips being displaced within the grooves to interlock with the walls thereof. 7 y

4. In a blade fastening devicgthe com bination with a rotor body having traits verse peripheral slots and grooiljes in the sides intersecting the slots, of .blade roots I and packing strips fitti'=g in and filling said slots, said packing Sti'iPS being split and rolled over to interlock with the walls of the grooves.

VILLIAM J. A. LONDON. GEORGE HUNTER PLAINE. ROBERT C. ALLEN.

Witnesses:

ARTHUR E. JoNns, BENJ. BowNn. 

